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peterd (6) [Avatar] Offline
The example doesn't pass JSHint. It looks like the `el` is undefined (should be `element`) and the RegEx isn't property escaped (missing a `` in `.com/widget`).

Here is the modified version:

function getScriptUrl() {
var scripts = document.getElementsByTagName('script'),

for (var i = 0; i < scripts.length; i++) {
element = scripts[i];
src = element.getAttribute ? element.getAttribute('src') : element.src;
if (src && / {
return src;
return null;